不同植物人工湿地对生活污水净化效果试验研究

Purifying effects of artificial wetland with different vegetation systems on domestic sewage

将象草(Pennisetum purpureum)和美人蕉(Canna india)应用于表面流人工湿地处理系统,探讨了该系统在不同温度下对生活污水中总氮和总磷的净化效果。结果表明,象草和美人蕉人工湿地系统净化生活污水的效果良好,TN的平均去除率分别为76.77%和66.49%,TP分别为82.99%和87.99%,COD分别为58.38%和49.49%;2种植物湿地系统对污水的处理效果与温度无显著相关性,净化效率随环境温度的上升而增加并趋于稳定。

The present paper cherishes its purpose to study the purifying effects of artificial wetland with different vegetation systems on domestic leftover sewage.So far as we know,there has been exiting quite a large number of studies in this way that claim to have discovered some plants can be used for this purpose.Many kinds of plants in wetland,so far as we know,can provide a substrate（roots,stems,and leaves） upon which microorganisms can grow as they break down some organic materials.The plants should have the ability of enduring pollution,good effect of decontamination,developed root system and strong resistance to diseases and insect-attacking,great economic value.For example,Canna india has been widely used in such artificial wetlands as a kind of pollution-resistant plant.However,Pennisetum purpureum is still under experiments.The purification effect of Pennisetum purpureum and Canna india on such sewage in the surface-flowing artificial wetland was studied.For this purpose,we have done testing and observation to study water quality of the flowing water,and purifying effect of TN and TP by using the above-said plant systems under the conditions of different temperatures are discussed.Our experiments are of practical significance in the sense of scientific research,data assistance and theoretical reasoning for Pennisetum purpureum,which can help to improve the wetland water environment quality and repair the sewage body.The results of our study indicate that both Pennisetum purpureum and Canna india enjoy a good purifying effect on the domestic sewage with a nice removal efficiency of TP and TN.Statistically,the average removal rate of COD is 58.38% and 49.49%,TN can be as high as 76.77% and 66.49%,and TP can be as high as 82.99% and 87.99%,respectively.Moreover,the sewage purification efficiency of the two plants in the artificial wetland has no direct correlation with the change of temperature,because the purification efficiency of Pennisetum purpureum and Canna india tends to increase first and then tend to be stable with the increase of ambient temperatures.